I was having a syntax error that I couldn’t figure out as well, but I figured it out.
Turns out that you can’t reference [your-email] (or whatever your email input field is called) in the “From” or the “Additional Headers” section on the Mail tab unless that field in the form is marked as REQUIRED.
In other words, you can only use that tag in those parts of the Mail tab if your form includes:
[email* your-email]
But if your form says:
[email your-email]
then you will be unable to use that tag in some places.
